JP2010133191A - Anti-inundation measure system of sewage facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flood damage prevention (anti-inundation measure) means in a sewage facility. <P>SOLUTION: This anti-inundation measure system includes a plurality of movable weirs and an analyzing device which receives information including a plurality of movable weirs, rainfalls at a plurality of points in a drain district, water levels of converging pipes at the plurality of points at present, heights of the plurality of movable weirs, and storage amounts of a plurality of rainfall storage facilities corresponding to the plurality of movable weirs and analyzes data to predict the stored amounts of the rainfall storage facilities in the future and to predict the stored amounts of the rainwater storage facilities corresponding to the movable weirs in the future when heights of the movable weirs are changed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to inundation countermeasure means for sewer facilities.

  In general, inundation damage is caused by rain overflowing the pipe from the pipe when the rainfall exceeds the flow capacity of the sewerage pipes (including confluence pipes), or rainwater can flow into waterways and rivers in a short time. It is caused by the flooding of them. The decrease in the area where rainwater penetrates underground due to urbanization is considered to be a cause of inundation damage. In particular, in a combined sewerage facility that treats sewage combined with sewage and rainwater, inundation damage can be a major problem in terms of environmental pollution and public health.

  On the other hand, sewerage facilities often have large rainwater storage facilities in the drainage basin, and also have a diversion weir in the drainage basin. Inundation measures are taken such that rainwater exceeding the height of the diversion weir is temporarily stored in a rainwater storage facility, and the stored rainwater is discharged little by little during normal (fine weather) times.

In addition, as a related prior document, patent documents 1-3 can be mentioned, for example.
JP 2002-298063 A Japanese Patent Laid-Open No. 11-190056 JP 2007-146423 A

  However, in the conventional sewerage facilities, even if the rainwater storage facilities and the diversion weirs as described above are provided, inundation damage may not be prevented.

  This invention is made | formed in view of such a situation, The subject is providing the inundation damage prevention (inundation countermeasure) means in a sewer facility.

  As a result of the survey, coupled with the frequent occurrence of local heavy rains in recent years, the fact that rainwater storage facilities and diversion weirs are not used in an effective manner is one of the reasons why flood damage cannot be prevented. I understood it.

  For example, if there are rainwater storage facilities and diversion weirs on the upstream and downstream sides of the pipe, recent heavy rains often occur locally as described above. Even when it was empty, there were cases where the downstream rainwater storage facilities were full and rainwater overflowed to the ground, causing inundation damage downstream. Conventionally, even if there are multiple rainwater storage facilities and diversion weirs in the drainage area, they are managed independently, whether they are fixed weirs or movable weirs. This is because there was no upstream rainwater storage facility, and it was not possible to store rainwater in consideration of the situation on the downstream side.

  As a result of repeated research, it collects rainfall information at multiple points, water level information of pipes, etc., and analyzes such information to analyze the water level in pipes at arbitrary points and sewage including rainwater flowing through pipes. Provision of the means to make the most effective use of multiple rainwater storage facilities in the drainage area by comprehensively controlling the multiple diversion weirs in the drainage area based on the prediction results It has been found that the above problems can be solved.

  That is, according to the present invention, a plurality of movable weirs that are provided in a sewer pipe of a sewerage facility and adjust the flow rate of sewage mainly containing rainwater to be taken into a corresponding rainwater storage facility from the sewer pipe, , Information including the amount of rainfall at a plurality of points in the drainage area, the water level of the sewer pipes at a plurality of points, the height of the plurality of movable weirs, and the amount of storage of a plurality of rainwater storage facilities corresponding to each of the plurality of movable weirs And analyze this information to determine the amount of storage in multiple rainwater storage facilities in the future (when the height of the movable weir remains the same (ie, when it is the same as the fixed weir)) An inundation countermeasure system is provided that includes an analysis device that predicts and predicts the storage amount of a rainwater storage facility corresponding to the movable weir in the future when the height of the movable weir is changed.

  In the inundation countermeasure system according to the present invention, the height of each of the plurality of movable weirs is such that the analysis device has the maximum amount of all or any two or more of the plurality of rainwater storage facilities in the future. It is preferable to have a means for obtaining.

  In the inundation countermeasure system according to the present invention, it is preferable that communication means for connecting the analysis device and the movable weir is provided, and the height of the movable weir is controlled based on the result of the analysis device.

  The inundation countermeasure system according to the present invention includes a plurality of movable weirs, an analysis device (control device), and preferably communication means. A plurality of movable weirs are provided in the sewer pipes of sewer facilities corresponding to the rainwater storage facilities. In the sewerage facility, when the water level of the sewer pipe rises due to rain and exceeds the height of the movable weir, the sewage mainly composed of rainwater is stored in the rainwater storage facility corresponding to the movable weir.

  The rainwater storage facility in this specification is a rainwater storage facility that is provided in plurality in a drainage area as a countermeasure against inundation. Inundation countermeasures mean storing sewage (sewage mainly composed of rainwater) so as not to be discharged.

  The inundation countermeasure system according to the present invention includes a plurality of movable weirs and a storage amount of a future rainwater storage facility (when the height of the movable weir remains as it is (that is, the same as the fixed weir)). And an analysis device that predicts the storage amount of the rainwater storage facility in the future when the height of the movable weir is changed, and based on the predicted storage amount of the rainwater storage facility, It can be used to adjust the height. For example, in the case of a heavy rain that occurs locally, the rainwater storage facility on the downstream side (of the sewer pipe) will be flooded when it is predicted that it will become full and the rainwater will overflow to the ground in the future. By reducing the height of the movable weir on the side, sewage mainly composed of rainwater can be stored in the rainwater storage facility on the upstream side to prevent or reduce inundation damage on the downstream side, and hence environmental pollution.

  Since the inundation countermeasure system according to the present invention preferably includes communication means, the height of the movable weir is controlled manually or semi-automatically by remote operation based on the predicted storage amount of the rainwater storage facility. It is possible to prevent or mitigate flood damage on the downstream side.

  In the inundation countermeasure system according to the present invention, preferably, the height of each of the plurality of movable weirs is such that the analysis device maximizes all or any two or more of the plurality of rainwater storage facilities in the future. Since it has the means to obtain, it is possible to maximize the inundation countermeasure capability of a plurality of rainwater storage facilities by controlling the dynamic weir so as to realize the obtained height.

  The inundation countermeasure system according to the present invention preferably includes communication means, and further, as described above, the analysis device is configured to maximize the storage amount of all or any two or more of the plurality of rainwater storage facilities in the future. In order to realize the required height, it is possible to operate a plurality of movable weirs automatically by remote control so that the required height can be obtained. Therefore, it is possible to prevent or reduce flood damage on the downstream side.

  For example, rainwater storage facilities A, B, C, and D are provided in a drainage area where a junction pipe of a combined sewerage facility is laid, and the rainwater storage facilities A, B, C, and D are connected to the drainage area. In addition, the movable weirs A, B, C, and D are provided in the junction pipe, the rainwater storage facility A and the movable weir A are present on the downstream side, and the rainwater storage facilities B, C, and D are branched to the upstream side. In the case where the movable weirs B, C, and D are present, if it is predicted that heavy rain occurs locally only on the downstream side, and the rainwater storage facility A overflows to cause inundation damage, Even if there is no rain or rain, all or any one of the rainwater storage facilities B, C, D are lowered by reducing the height of all or any one or any of the movable weirs B, C, D on the upstream side. Or, store sewage to 2 to prevent or reduce inundation damage on the downstream side Possible it is. The choice of reducing the height of all or any one or two of the upstream movable weirs B, C, D reduced the rainfall situation on the upstream side and the height of the movable weirs B, C, D What is necessary is just to determine based on the predicted value base of the future storage amount of the rainwater storage equipment B, C, D in the case.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate, but the present invention should not be construed as being limited thereto. Various changes, modifications, improvements, and substitutions can be added based on the knowledge of those skilled in the art without departing from the scope of the present invention. For example, the drawings show preferred embodiments of the present invention, but the present invention is not limited by the modes shown in the drawings or the information shown in the drawings. In practicing or verifying the present invention, the same means as described in this specification or equivalent means can be applied, but preferred means are those described below.

  [Inundation Countermeasure System] First, the inundation countermeasure system according to the present invention will be described in comparison with conventional inundation countermeasure means while showing a combined sewerage facility including the inundation countermeasure system.

  1 and 2 are schematic diagrams showing a combined sewerage facility, and FIG. 1 is a combined sewerage facility in which the inundation countermeasure system according to the present invention is adopted, so that no inundation damage has occurred. FIG. 2 shows a state in which flood damage has occurred on the downstream side by the conventional flood countermeasure means.

  The combined sewerage facility by the conventional inundation countermeasure means shown in FIG. 2 includes a sewage treatment plant, a merging pipe laid in a drainage area that is handled by the sewage treatment plant, and a fixed weir A provided in the merging pipe, B, C, D, and rainwater storage facilities A, B, C, D provided corresponding to these fixed weirs.

  The rainwater storage facility A and the fixed weir A exist on the downstream side, and the rainwater storage facilities B, C, and D and the fixed weirs B, C, and D exist on each upstream side branched therefrom. The sewage in which sewage and rainwater join together enters the joining pipe in order from the upstream side, flows down the joining pipe and flows into the sewage treatment plant, where it is processed into water that can be discharged. If the amount of sewage increases due to rainfall, etc. and exceeds the flow capacity of the merge pipe, the sewage will flow into one of the corresponding rainwater storage facilities through one of the fixed weirs and will be stored. When the amount decreases, it is returned to the junction pipe by a pump or the like, and flows down and is treated at the sewage treatment plant.

  Usually, the fixed weir is set so that the sewage flows into the corresponding rainwater storage facility when it exceeds the flow capacity of the merging pipe portion provided with the fixed weir. Since the heights of the fixed weirs B, C, and D on the upstream side are constant, the sewage will flow into the merging pipe as long as it is within the spilling capacity of the merging pipe regardless of the downstream rainfall situation or the storage state of the rainwater storage facility A. Down to the sewage treatment plant. Therefore, for example, in the state where the storage amount of the rainwater storage facility A is full due to the previous rainfall, local heavy rain occurs on the downstream side, or a large amount of rainwater due to the rainfall generated on the upstream side is downstream. When they gather or both occur, the sewage from the junction pipe beyond the fixed weir A loses its place and overflows to the ground, causing inundation downstream. On the upstream side, if it is within the flow capacity of the merging pipe, the sewage flows down the merging pipe. Therefore, even if inundation damage occurs on the downstream side, the storage amount of the upstream rainwater storage facilities B, C, D May have some room. Even if the fixed weirs A, B, C, and D are movable weirs, the same problem can occur if the height is adjusted without considering the downstream rainfall situation or the storage state of the rainwater storage facility A. .

  Such a problem does not occur in a combined sewerage facility provided with the inundation countermeasure system according to the present invention. The combined sewerage facility shown in FIG. 1 includes a sewage treatment plant, a merging pipe laid in a drainage area handled by the sewage treatment plant, rainwater storage facilities A, B, C, and D, and an inundation according to the present invention. And a countermeasure system. The inundation countermeasure system according to the present invention connects the movable weirs A, B, C, and D provided in the junction pipe, the analysis device, and the analysis device and the movable weirs A, B, C, and D (for example, wired connection). ) Provide communication device. The movable weirs A, B, C, D and the rainwater storage facilities A, B, C, D are provided correspondingly. The analysis device is configured by an information processing device (computer), and is installed in a control panel in the sewage treatment plant or in a management room outside the sewage treatment plant.

  The rainwater storage facility A and the movable weir A are present on the downstream side, and the rainwater storage facilities B, C, D and the movable weirs B, C, D are present on the upstream sides branched therefrom. The sewage in which sewage and rainwater join together enters the joining pipe in order from the upstream side, flows down the joining pipe and flows into the sewage treatment plant, where it is processed into water that can be discharged. When the amount of sewage increases due to rainfall, etc. and exceeds the flow capacity of the merge pipe, the sewage flows into one of the corresponding rainwater storage facilities through one of the movable weirs and is stored. When the amount decreases, it is returned to the junction pipe by a pump or the like, and flows down and is treated at the sewage treatment plant. This point is the same as the combined sewage facility by the conventional measures against flooding.

  The movable weirs A, B, C, and D are weirs that adjust the flow rate of sewage to be taken into the corresponding rainwater storage facilities A, B, C, and D, preferably electrically or mechanically by an external signal. In addition, the height can be adjusted. The analysis device includes the amount of rainfall at multiple points in the drainage basin, the level of the junction pipe at the multiple points, the height of the multiple movable weirs, and the amount of storage of multiple rainwater storage facilities corresponding to each of the multiple movable weirs Input information and analyze this information to predict the amount of future rainwater storage facilities, and the amount of rainwater storage facilities corresponding to future movable weirs when the height of the movable weir is changed Can be predicted. In addition, the analysis device can measure the height of each of the movable weirs A, B, C, and D so that the storage amount of all or any two or more of the rainwater storage facilities A, B, C, and D will be maximized in the future. For example, if a control signal having the obtained height is transmitted to the movable weirs A, B, C, D via the communication device, the movable weir A, The heights of B, C, and D can be automatically controlled.

  Since the combined sewerage facility shown in FIG. 1 includes the inundation countermeasure system according to the present invention, the downstream rainfall situation, the current storage state of the rainwater storage facility A, and the predicted future of the rainwater storage facility A Based on the increase in the amount of storage, for example, even if there is no rainfall on the upstream side and the amount of sewage on the upstream side is within the flow capacity of the merge pipe, the amount of storage in the rainwater storage facility A for the previous rainfall is If the water is full or if there is a local heavy rain on the downstream side or both of them, the height of the movable weirs B, C, and D is lowered, and the sewage is connected to the downstream side with a merge pipe. It is possible to take the option of storing the rainwater storage facilities B, C, and D on the upstream side without flowing down. Therefore, in the downstream, there is little risk that sewage will lose its place and overflow to the ground and cause inundation. If the inundation countermeasure system according to the present invention is provided, even if inundation occurs at any place, all the rainwater storage facilities A, B, C, and D are almost fully filled with capacity. It is after demonstrating the ability to the maximum or close to it.

  [Analyzer] Next, an analyzer of the inundation countermeasure system according to the present invention will be described.

  In operating the inundation countermeasure system according to the present invention, the current rainfall at each point in each area where the rainwater storage facilities A, B, C, D and movable weirs A, B, C, D are provided in the drainage area. Exchange of information including the amount, the water level of the junction pipe at each point in each area, the height of the movable weirs A, B, C, D, the storage amount of the rainwater storage facilities A, B, C, D, and Analysis of information is important, and the analysis device takes charge of it. In addition, since it is necessary to disclose the information on flood countermeasures to citizens, the flood countermeasure system according to the present invention includes means for disclosing data on flooding including weather information and analysis results as necessary. It is preferable.

  Information exchange and analysis in the inundation countermeasure system according to the present invention is performed by, for example, a computer in a control panel disposed in a management room of a sewage treatment plant, an information collection server disposed in or outside the sewage treatment plant, information In a network system including a providing server (including an analysis apparatus) and a public server, the following is performed.

  FIG. 5 is a diagram showing information processing in the inundation countermeasure system according to the present invention, and is a flowchart showing the flow of information from top to bottom. Information necessary for properly operating the inundation countermeasure system according to the present invention includes, for example, meteorological data (weather forecast for each point), rainfall data (rainfall amount for each point, etc.), water level data (joint for each point) The water level in the pipe, the water level of the discharge destination (river, sea area, etc.), and facility operation data (operating status of various pumps (sewage pump, rainwater pump, etc.), height of movable weir, etc.). These pieces of information are input to the information collection server via, for example, a computer in the control panel. It is preferable to input the weather data directly to the information collecting server in order to eliminate the time difference. These meteorological data and rainfall data are collected from, for example, the Japan Meteorological Agency, private weather companies, (directly) radar, and the like. Water level data and facility operation data are collected from detectors, control computers, pump power panels, etc. provided at the respective locations.

  As specific input data, for example, the rainfall data is, for example, the amount of rainfall every 10 minutes at each point in each area provided with rainwater storage facilities A, B, C, D and movable weirs A, B, C, D ( The water level data is, for example, the water level (m, TP (Tokyo Bay average sea level)) at each point in each area, and the facility operation data are movable weirs A and B. , C, D height.

  Various data is sent from the information collection server to the information providing server, where various analysis is performed. Necessary information is sent to the related departments, and information to be disclosed to the residents is disclosed via a public server. Information sent to the relevant departments includes flow rate data (flow rate at any point in the merge pipe, flow rate of the sedimentation basin (pump station) at the sewage treatment plant, etc.), (for example) storage data for the rainwater storage facilities (current and future) Storage amount). The information to be disclosed to the residents is, for example, inundation level data.

As specific output data, the storage amount data of the rainwater storage facility is, for example, the storage amount (m ³ ) of the storage tank every 10 minutes, and the flow rate data is, for example, the rainwater storage facility A, B, C, D And the instantaneous flow rate (m ³ / sec) in the merging pipe every 10 minutes at each point in each area provided with movable weirs A, B, C, and D. Is the inundation level (m) every 10 minutes.

  The information sent to each department and the information to be disclosed to the residents are based on the sent rainfall data, water level data, and facility operation data. It is analyzed by the ground surface inundation model, etc., and becomes flow rate data to be output, storage amount data of rainwater storage facilities, and inundation level data. Although not shown in FIG. 5, as described above, the movable weir that will maximize the storage amount of all or any of the rainwater storage facilities A, B, C, and D in the future. The respective heights of A, B, C, and D can be calculated by back calculation and sent to the relevant departments, or directly output as a signal for controlling the movable weir.

  FIG. 6 is a graph showing an outline of an example (simple formula) of a rainfall prediction model used in the analysis apparatus. The predicted rainfall can be obtained by calculating the rate of increase in rainfall from the actually measured past rainfall data and multiplying that rate by time. For example, on the graph, if you connect the current value to the current value from 2 minutes before, extend it to 15 minutes ahead, and draw a straight line so that the rainfall will be 0 (zero) 30 minutes from 15 minutes ahead The total rainfall up to 30 minutes ahead can be predicted.

  7A to 11 are diagrams showing an outline of an example of a ground surface runoff model used in the analysis apparatus. This ground surface runoff model is composed of two types: an effective rainfall model incorporating a rainfall loss factor and a ground surface flow model that converts effective rainfall into a hydrograph at the inflow manhole point.

  FIG. 7A to FIG. 7C are explanatory diagrams showing an example of an effective rainfall model, and FIG. 8A to FIG. 8D are graphs showing an example of an effective rainfall model. As shown in FIG. 7A to FIG. 7C and FIG. 8A to FIG. 8C, the effective rainfall (rainfall amount) varies depending on whether the place where the actual rainfall occurred is an infiltration area, a semi-infiltration area, or an impermeable area. In addition, when obtaining effective rainfall (rainfall), concave storage (loss) is excluded. For example, if there is actual rainfall of 100 mm, there is no penetration loss in the impervious area where the impervious area rate is 50% (see FIG. 7A and FIG. 8A), so from 50 mm (= 100 mm × 50%), The effective rainfall is 47.00 mm, which is a reduction of the concave storage loss of 3.00 mm, and there is a lot of effective rainfall. However, for example, in the infiltration area where the impervious area ratio is 30% (see FIG. 7C and FIG. 8C), all 28.20 mm obtained by reducing the concave storage loss 1.80 mm out of 30 mm (= 100 mm × 30%) Permeates and has less effective rainfall (as a whole area). Further, in the semi-penetrated area (see FIGS. 7B and 8B) where the impervious area ratio is 20%, the effective rainfall is in the middle. That is, 9.40 mm which is a half of 18.80 mm obtained by subtracting 1.20 mm of the concave storage loss permeates 20 mm (= 100 mm × 20%).

  7A and 8A are diagrams for explaining the effective rainfall in the impermeable area, but are diagrams for explaining the concept, and FIG. 7A and FIG. 8A do not show the same situation. . The same applies to FIGS. 7B and 8B (semi-penetration zone) and FIGS. 7C and 8C (penetration zone). Moreover, FIG. 8D represents the effective rainfall model of the whole basin combining the infiltration area, the semi-infiltration area, and the non-infiltration area.

Specifically, the effective rainfall R (t) in the effective rainfall model is obtained by subtracting the concave storage (loss), which is the initial loss _Qini , from the actual rainfall Rr (t) and multiplying by the impervious area rate considering the infiltration loss. Can be calculated. Effective rainfall R (t), when the actual rainfall Rr (t) is less than the initial loss _{Q ini} is 0 (zero), when the actual rainfall Rr (t) exceeds the initial loss _{Q ini,} the following ( It is obtained by the equation (1). In equation (1), if the ratio between the outflow rate observed in the actual watershed and the impervious area rate is defined as a reduction factor, equation (2) is obtained. In other words, the reduction coefficient is a correction coefficient for matching the outflow rate with the impervious area rate estimated from a map or the like. Further, the impervious area ratio in the equation (2) is obtained by the equation (3).

Effective rainfall R (t) = Actual rainfall Rr (t) x Runoff rate (1)

Effective rainfall R (t) = actual rainfall Rr (t) × impervious area ratio I _mp × reduction factor Q _red
... (2)

  9 and 11 are graphs showing the concept of an example of the ground surface flow model, and FIG. 10 is an explanatory diagram showing the concept of an example of the ground surface flow model. In the ground surface flow model, the inflow hydro is calculated by the time / area curve considering the basin shape and the inflow time based on the previously calculated effective rainfall. The basin is divided into many concentric cells centered on the inflow manhole. FIG. 9 shows the effective rainfall (rainfall amount) per unit time (simulation time interval Δt) into which the inflow time is divided, and FIG. 10 shows the time (the above-described unit of arrival time to the inflow manhole). The basin for each time (simulation time interval Δt) is shown (that is, FIG. 10 is an equi-arrival time zone diagram), and FIG. 11 shows the calculation of inflow hydro.

  Specifically, the number of cells n is calculated from the following equation (4), and the inflow hydro is determined by equation (5).

  The in-pipe hydraulic model for calculating the flow in the confluence pipe can be constructed by using the Samvenin formula (Dynamic wave method). The Sambunan formula is based on the conservation law of mass and momentum, and the following formula (6) (continuous (Expression), (7) (Expression of motion).

  12 and 13 are explanatory diagrams showing the concept of an example of the ground surface flooding model. According to the ground surface inundation model, since the amount of rainfall is large, it is possible to obtain a mode (flow path, flow rate) in which sewage overflowing from the junction pipe (mainly initial polluted water) flows down the ground surface and moves. The sewage overflowing from the merging pipe flows down and moves depending on the ground level difference, but the surface inundation model has the terrain of the basin as data (two-dimensional surface data with elevation), and the terrain of the basin. Can be used to express (reproduce) the inundation movement. The ground surface inundation model can be expressed by a mass conservation equation (continuous equation) and a motion equation (X direction and Y direction).

  Hereinafter, the present invention will be specifically described by simulation (referred to as examples in the present specification), but the present invention is not limited to these examples.

(Comparative Example 1) In the sewerage facility shown in FIG. 2, the area of the basin that the rainwater storage facility A in the drainage area is responsible for is 100ha, and the outflow rate (impervious area ratio × reduction factor) in the basin is 0.5, initial. The loss was 0 (zero), the capacity of the rainwater storage facility A was 10,000 m ³ , and the flow capacity of the junction pipe was 40 mm / h. Similarly, the area of the basin that the rainwater storage facility B is responsible for is 120 ha, the outflow rate (impervious area rate × reduction factor) in the basin is 0.5, the initial loss is 0 (zero), and the capacity of the rainwater storage facility B is 12000 m. ^3. The flow capacity of the merging pipe is 40 mm / h, the area of the basin that the rainwater storage facility C is responsible for is 150 ha, the outflow rate (impervious area ratio × reduction factor) in that basin is 0.5, and the initial loss is 0 (zero) ) The capacity of the rainwater storage facility C is 15000 m ³ , the flow capacity of the confluence pipe is 40 mm / h, the area of the basin that the rainwater storage facility D is responsible for is 200 ha, and the outflow rate (impervious area rate x reduction factor) in the basin 0.5, the initial loss was 0 (zero), the capacity of the rainwater storage facility D was 20000 m ³ , and the flow capacity of the junction pipe was 40 mm / h.

  Under the above conditions, from 8:00 am, there is rainfall with a rainfall exceeding 25 mm / h in the area where the rainwater storage facility A and the fixed weir A are provided. Similarly, the rainwater storage facility B and the fixed weir B There is rainfall of 20 mm / h or more in the area where the merging pipe flows, and rain water storage equipment in which the storm water storage facility C and the fixed weir C have rainfall of 15 mm / h or more. In the area where D and the fixed weir D are provided, the change in the flow rate in the merging pipe and the change in the storage amount of the rainwater storage facility when there was rainfall of 10 mm / h or more in the area where the merging pipe flowed down were obtained. The results are shown in FIGS. 3A to 3D and FIGS. 4A to 4D and Table 1. 3A is a graph showing the transition of the flow rate in the junction pipe in the vicinity of the fixed weir A, and FIG. 4A is a graph showing the transition of the storage amount of the rainwater storage facility A. Similarly, FIG. 3B is a graph showing the transition of the flow rate in the junction pipe near the fixed weir B, and FIG. 4B is a graph showing the transition of the storage amount of the rainwater storage facility B. 3C is a graph showing the transition of the flow rate in the junction pipe near the fixed weir C, and FIG. 4C is a graph showing the transition of the storage amount of the rainwater storage facility C. FIG. 3D is a graph showing the transition of the flow rate in the junction pipe near the fixed weir D, and FIG. 4D is a graph showing the transition of the storage amount of the rainwater storage facility D.

As shown in FIG. 3A to FIG. 3D and FIG. 4A to FIG. 4D, since there was rainfall exceeding the flow capacity of the merge pipe in all drainage areas, all of the fixed weirs A, B, C, and D Around 10:00, the flow velocity required to flow down the sewage, mainly rainwater, exceeded the flow down capacity of the junction pipe. That is, the sewage flowed into the rainwater storage facilities A, B, C, D beyond the fixed weirs A, B, C, D. Then, in the rainwater storage facility A provided in the area where the rainfall exceeding the flow capacity of the junction pipe is the largest, the water becomes full after about 40 minutes, and then overflows, and the area (downstream) is inundated with an inundation amount of 2500 m ^3. Occurred.

(Embodiment 1) In the sewerage facility shown in FIG. 1, according to Comparative Example 1, the area of the basin that the rainwater storage facility A in the drainage area is responsible for is 100ha, and the runoff rate in that basin (impervious area ratio × reduction factor) ) Is 0.5, the initial loss is 0 (zero), the capacity of the rainwater storage facility A is 10000 m ³ , and the flow capacity of the junction pipe is 40 mm / h. Similarly, the area of the basin that the rainwater storage facility B is responsible for is 120 ha, the outflow rate (impervious area rate × reduction factor) in the basin is 0.5, the initial loss is 0 (zero), and the capacity of the rainwater storage facility B is 12000 m. ^3. The flow capacity of the merging pipe is 40 mm / h, the area of the basin that the rainwater storage facility C is responsible for is 150 ha, the outflow rate (impervious area ratio × reduction factor) in that basin is 0.5, and the initial loss is 0 (zero) ) The capacity of the rainwater storage facility C is 15000 m ³ , the flow capacity of the confluence pipe is 40 mm / h, the area of the basin that the rainwater storage facility D is responsible for is 200 ha, and the outflow rate (impervious area rate x reduction factor) in the basin 0.5, the initial loss was 0 (zero), the capacity of the rainwater storage facility D was 20000 m ³ , and the flow capacity of the junction pipe was 40 mm / h.

  Under the above conditions, from 8:00 am, there is rainfall with a rainfall amount exceeding 25 mm / h in the area where the rainwater storage facility A and the movable weir A are provided. Similarly, the rainwater storage facility B and the movable weir B There is rainfall of 20 mm / h or more in the area where the merging pipe flows, and rain water storage equipment where the storm water storage facility C and the movable weir C have rainfall of 15 mm / h or more in the area where the merging pipe flows. In the area where D and the movable weir D are provided, the transition of the flow rate in the merging pipe and the transition of the storage amount of the storm water storage facility when there was rainfall of 10 mm / h exceeding the spilling capacity of the merging pipe were obtained. However, in Example 1, the amount of rain exceeding the flow capacity of the junction pipe was the largest in the area where the rainwater storage facility A and the movable weir A were provided, so that the sewage flows into the rainwater storage facility A through the movable weir A. From the time when it started to run (around 10:00 am), the height of the movable weir D corresponding to the rainwater storage facility D with the most storage capacity was lowered, and a larger amount of sewage was stored on the upstream side. It was made to be stored in equipment D. The results are shown in Table 1 while being superimposed on the results of Comparative Example 1 in FIGS. 3A to 3D and FIGS. 4A to 4D. 3A is a graph showing the transition of the flow rate (velocity) in the junction pipe near the movable weir A, and FIG. 4A is a graph showing the transition of the storage amount of the rainwater storage facility A. Similarly, FIG. 3B is a graph showing the transition of the flow rate in the junction pipe near the movable weir B, and FIG. 4B is a graph showing the transition of the storage amount of the rainwater storage facility B. 3C is a graph showing the transition of the flow rate in the junction pipe near the movable weir C, and FIG. 4C is a graph showing the transition of the storage amount of the rainwater storage facility C. 3D is a graph showing the transition of the flow rate in the junction pipe near the movable weir D, and FIG. 4D is a graph showing the transition of the storage amount of the rainwater storage facility D. 3A, FIG. 3D, FIG. 4A, and FIG. 4D, the thick line portion is different from Comparative Example 1, and the rest is the same as Comparative Example 1.

  As shown in FIG. 3A, FIG. 3D, FIG. 4A, and FIG. 4D, the rainwater storage facility A on the downstream side overflows because the sewage mainly containing rainwater is stored (absorbed) in the rainwater storage facility D on the upstream side. In the meantime, it was possible to prevent the occurrence of inundation damage in the area where the rainfall that exceeded the flow capacity of the junction pipe was the largest.

  The inundation countermeasure system according to the present invention is suitably used as an inundation countermeasure means in a combined sewer facility.

It is a schematic diagram which shows the confluence | merging type sewer facility by which the inundation countermeasure system which concerns on this invention was employ | adopted. It is a schematic diagram which shows the confluence | merging type sewer facility by the conventional inundation countermeasure means. It is a figure which shows the result of an Example, and is a graph showing transition of the flow volume in a merging pipe. It is a figure which shows the result of an Example, and is a graph showing transition of the flow volume in a merging pipe. It is a figure which shows the result of an Example, and is a graph showing transition of the flow volume in a merging pipe. It is a figure which shows the result of an Example, and is a graph showing transition of the flow volume in a merging pipe. It is a figure which shows the result of an Example and is a graph showing transition of the storage amount of rainwater storage equipment. It is a figure which shows the result of an Example and is a graph showing transition of the storage amount of rainwater storage equipment. It is a figure which shows the result of an Example and is a graph showing transition of the storage amount of rainwater storage equipment. It is a figure which shows the result of an Example and is a graph showing transition of the storage amount of rainwater storage equipment. It is a flowchart showing the information processing in the inundation countermeasure system which concerns on this invention. It is a graph which shows the outline | summary of an example (simple formula) of the precipitation prediction model used with the analyzer in the inundation countermeasure system which concerns on this invention. It is explanatory drawing which shows the concept of an example of the effective rainfall model used with the analyzer in the inundation countermeasure system which concerns on this invention, and is the figure showing the loss (concave storage, infiltration) in an impermeable area with the image. It is explanatory drawing which shows the concept of an example of the effective rainfall model used with the analyzer in the inundation countermeasure system which concerns on this invention, and is the figure showing the loss (recessed land storage, infiltration) in a semi-infiltration area by the image. It is explanatory drawing which shows the concept of an example of the effective rainfall model used with the analyzer in the inundation countermeasure system which concerns on this invention, and is the figure which represented the loss (concave storage, infiltration) in an infiltration area with an image. It is a graph which shows the concept of an example of the effective rainfall model used with the analysis apparatus in the inundation countermeasure system which concerns on this invention, and is the graph which represented the loss (concave storage, infiltration) in the impervious area with the rainfall every time passage. is there. It is a graph which shows the concept of an example of the effective rainfall model used with the analysis apparatus in the inundation countermeasure system which concerns on this invention, and is the graph which represented the loss (concave storage, infiltration) in a semi-penetration area by the rainfall every time passage. is there. It is a graph which shows the concept of an example of the effective rainfall model used with the analyzer in the inundation countermeasure system which concerns on this invention, and is the graph which represented the loss (concave storage, infiltration) in an infiltration area by the amount of rainfall for every time passage. . It is a graph which shows the concept of an example of the effective rainfall model used with the analysis apparatus in the inundation countermeasure system which concerns on this invention, and represented the loss (concave storage, infiltration) in the whole area (whole basin) with the rainfall every time passage. It is a graph. It is a graph which shows the concept of an example of the ground surface downflow model used with the analyzer in the inundation countermeasure system which concerns on this invention. It is explanatory drawing which shows the concept of an example of the ground surface downflow model used with the analyzer in the inundation countermeasure system which concerns on this invention. It is a graph which shows the concept of an example of the ground surface downflow model used with the analyzer in the inundation countermeasure system which concerns on this invention. It is explanatory drawing which shows the concept of an example of the ground surface inundation model used with the analyzer in the inundation countermeasure system which concerns on this invention. It is explanatory drawing which shows the concept of an example of the ground surface inundation model used with the analyzer in the inundation countermeasure system which concerns on this invention.

Claims (3)

A plurality of movable weirs that are provided in a sewer pipe of a sewerage facility and adjust the flow rate of sewage mainly from rainwater to be taken into a corresponding rainwater storage facility;
The amount of rainfall at a plurality of points in the drainage area, the water level of the sewer pipes at a plurality of points, the height of the plurality of movable weirs, the amount of storage of a plurality of rainwater storage facilities corresponding to each of the plurality of movable weirs, In addition to predicting the future storage amount of the plurality of rainwater storage facilities and changing the height of the movable weir, the future movable weir An analysis device for predicting the storage amount of rainwater storage equipment corresponding to
Inundation countermeasure system equipped with.   The said analysis apparatus has a means which calculates | requires each height of these several movable weirs so that the storage amount of all or any two or more of these several rainwater storage facilities may become the maximum in the future. The inundation countermeasure system according to 1.   The inundation countermeasure system according to claim 1, further comprising a communication unit that connects the analysis device and the movable weir, and controlling a height of the movable weir based on a result of the analysis device.

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